Core-drill apparatus.



UNITED ST TES Patented May 23, 1905.

PATENT OFFICE.

COLEMAN A. TERRY, OF NEW YORK, N. Y., ASSIGNOR TO DAVIS CALYX DRILL COMPANY, or NEW YOR VIRGINIA.

K, N. Y., .A CORPORATION OF VEST CORE-DRILL APPARATUS- SPECIFIGATION forming part of Letters Patent N0. 790,331, dated May 23, 1905.

Application filed August 25, 1904:. Serial No. 222,055.

To all whom it may concern:

Be it known that I, COLEMAN A. TERRY, a citizen of the United States of America, and a resident of the city, county, and Stateof New York, have invented certain new and useful Improvements. in Core-Drilling Apparatus, of which the followingis a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to improvements in core-drilling apparatus; and it consists, first, in an improved form and construction of double core-barrel, and, second, in an improved core breaking and lifting device.

Drills having double core-barrels are employed when boring in soft material, such as bituminous coal and the like, as cores of such theoretically the outer surface of the core should not touch the inner surface of the corebarrel, the bit being constructed to give clearance, in practice it is impossible to prevent this occurrence. Further, a core will often break at a seam and will then rest against the core barrel. carry the core around with it and will wear the same away by grinding the lower end of the broken portion of the core against the upper end of the unbroken portion. Further, the rush of the water employed for washing .up the detritus acts on soft material-to wash same away and tends also to destroy and break up a core. I

It is one of the main objects of my present .invention to improve the construction of double core-barrels, the inner one of which is hung freely, so that it may engage the core without rotating it, the outer core-barrel carrying the bit and revolving for the purpose .of imparting the cutting action.

A further object of my invention is to prevent the water from passing through the in- A revolving core-barrel will.

drill is also shown.

prove core breaking and lifting devices and to simplify same. After a core has reached a certain length it is necessary to break it off and lift it up, and numerous more or less complicated devices have been devised for this purpose. I have provided a very simple and efficient form of core breaking and lifting device, comprising a ring loosely supported near the foot of the drill and so supported that when moved in one direction it will pass freely over the core without gripping same, while when moved in the other direction it will firmly grip the core and at the same time apply lateral pressure thereto to break same.

In order that my invention may be clearly understood, I, will describe an embodiment thereof and will then point out the novel features in claims.

' In the drawings, Figure .1 is a view in central vertical section of a core-drill embodying my invention. Fig. 2 is a view of the lower end of the core-barrel, the core-bit,-and the core breaking and lifting. ring, showing the latter in a different position to that shown in Fig. 1, the section thereof being taken substantially upon the line 2 2 of Fig. 1 Fig. 3 shows a slight modification in which my improved core breaking and lifting device is shown as applied to a single-barrel core-drill.

I will first refer to Figs. 1 and 2 of the drawings, in which a drill employing adouble core-barrel is employed. That part of the drill shown comprises a drill-rod 1, a plug or coupler 2, an exterior core-barrel 3, rigidly secured to the plug or coupler, as by a screwthreaded connection, and a drill-bit or cutter 4, rigidly secured to the lower end of the said exterior core-barrel. A portion of the calyx 5 employed in the well-known Davis calyx- The drill-rod 1 is hollow, as is usual, and opens into a chamber 6 in the plug or coupler 2. Channels 7 afford communication between the said chamber 6 and the interior of the outer core-barrel 3. The inner sleeve or core-barrel 8 is carried by a head 9, supported upon a stud 10, rigidly secured to the plug or coupler 2. Ball-bearings 11 are interposed between the head 9 and the stud 10 in order to reduce friction at this point. The lower end of the head 9 is provided with a cap 12, in which is arranged a valve-seat 13 for a ball-valve 14. Channels 15 afford a communication between the annular channel bounded by the interior of the outer core-barrel 3 and the exterior of the inner sleeve 8 and head 9 and a chamber 16, inclosed by the head 9 and the valve 14. In order to guide the lower end of the inner corebarrel or sleeve 8, I have provided a ballbearing comprising a plurality of spheres 17, guided and retained in a groove 18 in the exterior surface of the said inner sleeve 8. In order to insert the spheres in position, Ihave provided an opening 19 in the outer core-barrel 3, which opening I have closed by a screwthreaded plug 20. By removing the screwthreaded plug 20 and shifting the inner and outer sleeves 8 and 3 with respect to each other so as to bring the groove 18 opposite the opening 19 the spheres may be inserted or removed at will. I

In operation the drill is rotated in the usual or any desired manner, the cutter 4 cutting an annular groove and the remaining core being received within the core-barrel. The inner sleeve 8, which usually comes in contact with some portion of the core, may remain stationary with the core, whereby damage to the core is reduced to a minimum, the outer core-barrel 3, which carries the cutter, freely revolving without imparting such movement to the inner corebarrel. Water supplied through the drill-rod 1 to wash up the detritus from the bit will pass through the chamber 6 and along the channels 7 down between the inner and outer core-barrels to the interior of the bit 4 and thence beneath the bit upward around the exterior of the outer core-barrel to waste or return. Free passage for the water then is provided to the bit between the sleeves, passage to within the inner sleeve 8 being closed by the ball-valve 14. Thus the core within the inner core-barrel will be protected from the destructive action of a continuous flow of water. In first starting up, however, there will be more or less air to be got rid of within the inner barrel 8, and the valve 14 may then open to act as a vent to relieve the air while automatically closing to prevent currents of water downward therethrough. The ball-bearings 17, while forming a perfect lateral support for the inner sleeve or barrel 8, do not prevent the desired flow of water past same. Preferably I employ a fewer number of balls than will entirely fill the channel 18 throughout its length, so as to afford a still further opening for the free passage of water. By this arrangement and construction I am enabled to bore in very soft material, such as bituminous coal and the like, and still preserve the core.

In order to break off and lift the core, I have provided a core breaking and lifting ring 21, carried by the inner sleeve 8 on one side thereof. The present construction comprises a hook 22, secured to or formed integrally with the ring 21, which hook rests upon shoulders 23, formed in a cut-out portion at the lower end of the sleeve 8. The normal rest position for the ring will be as is shown in Fig. 2, the ring supported upon one side by the hook 22 and allowed to rest upon its other side upon a shoulder 24, formed on the inner surface of the outer core-barrel or of the bit 4. hen the drill is at work, however, and moving slowly downward, the frictional engagement of the interior of the ring 21 with the exterior of the core will tend to lift same to a position as shown in Fig. 1, and so long as the drill is moving downward in operation the tendency of the ring 21 will he to assume such position. If, however, the operation of the drill be stopped and power applied to lift the same from out of the hole in which it is working, the ring 21 will immediately cant, as shown in Fig. 2, gripping the core and giving a slight lateral or twisting action upon the core, so as to break it off and hold the portion broken off while the drill is being lifted, so that such portion of the core will be lifted with the drill. This portion of my invention is equally applicable to single-barrel drills, and in Fig. 3 I have shown a ring 29 as applied to a drill of this character. In Fig. 3 the ring is shown as confined between the stationary ring 25, the lower edge of which answering in this connection to the lower face of the sleeve 8, and a ring 26, having an 11prising shoulder 27 and a shoulder 28 at a lower level. The shoulder 27 supports the ring 25 and acts in the same manner as the shoulder 23 in the other figures, while shoulder 28 acts as a limiting-stop in the same manner as the shoulder 24 of the other figures. The operation of the core breaking and lifting ring in this construction is precisely similar to the operation of the core breaking and lifting ring illustrated in the other figures.

It will be obvious that the foregoing is but one embodiment of my invention and that the same is capable of many and varied modific: tions within the spirit and scope of my invention, and, further, that certain parts may be employed in connection with other parts of different construction. H encel do not desire to be limited only to the precise details of construction and combination of parts herein.

hat I claim is 1. In core-drilling apparatus, the combination with a d rill-rod, a plug or coupler secured thereto, and an outer core-barrel rigidly secured to said plug or coupler, of a headed stud carried by said plug or coupler, an inner sleeve rotatably supported upon said headed stud, said head or coupler provided with a water-chamber, and a passage leading therefrom to between the inner sleeve and outer core-barrel.

2. In core-drilling apparatus, the combination witha drill-rod, aplug or coupler secured thereto, and an outer core-barrel rigidly secured to said plug or coupler, of a headed stud carried by said plug or coupler, an inner sleeve rotatably supported upon said headed stud, said head or coupler provided with a water-chamber, and a passage leading therefrom to between the inner sleeve and outer core-barrel, said inner sleeve provided with a passage for returnair-currents, and provided with a check-valve to prevent downward flow of water-currents.

3. In core-drilling.apparatus, the combination with fast and loose core-barrel sleeves arranged one within the other, the inner corebarrel suspended from a central 'pivot at its upper end and provided with a lateral hearing near its lower end.

4. In core-drilling apparatus, the combination with fast and loose core-barrel sleeves arranged one within the other, one of said sleeves provided with an annular groove for receiving bearing-balls, said sleeves provided with means for admitting said bearing-balls to said groove. 4

5. In core-drilling apparatus, the combination with fast and loose core-barrel sleeves ar ranged one within the other, the inner corebarrel sleeves provided with an annular channel 18 near its lower end for receiving bearing-balls, and the outer sleeve provided with an opening 19 normally out of register with said annular channel.

6. In core-drilling apparatus, the combination with fast and loose core-barrel sleeves arranged one within the other, of a core breaking and lifting ring supported by the inner said sleeve on one side thereof, the other. said sleeve provided with means for limiting the downward movement of the ring on the other.

the diagonal movement of the said ring 21,

but permitting such limited diagonal movement thereof.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

COLEMAN A. TERRY.

Witnesses:

D. HOWARD HAYWOOD, O. F. OARRINe'roN. 

